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The squeal will probably go away from just driving the car 50 or 100 miles country, or an afternoon of city driving.

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Time to put vacuum and hydraulics on the back burner and deal with the friction.

The squeal is caused by the brake shoe vibrating when pressed against the drum, usually due to the surfaces not mating smoothly.
In the pictures, the shoes look to have plenty of material and don’t look glazed, and the drums don’t look bad but you said there are some ridges. You should be able to bed the shoes to address the issue.